print {$OUT} map "@$_\n", sort { $a->[10] cmp $b->[10] } @out;
Gratuitous use of curlies: sometimes it is necessary to employ a BLOCK returning a file handle, but here it isn't.
Then, - TIMTOWTDI - see the special variable $" in perlvar:
{
local $" = "\t";
print $OUT map "@$_\n", sort { $a->[10] cmp $b->[10] } @out;
}
Here, the curlies are necessary to localize the (otherwise global) variable $" to the enclosed block.
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